| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 17°F | 34°F | 25°F | 3.1" |
| February | 18°F | 36°F | 27°F | 2.2" |
| March | 28°F | 50°F | 38°F | 2.7" |
| April | 38°F | 64°F | 50°F | 3.6" |
| May | 48°F | 74°F | 61°F | 4.2" |
| June | 58°F | 83°F | 70°F | 4.2" |
| July | 62°F | 85°F | 73°F | 4.5" |
| August | 60°F | 83°F | 72°F | 4.9" |
| September | 53°F | 78°F | 65°F | 4.0" |
| October | 43°F | 65°F | 53°F | 4.5" |
| November | 32°F | 52°F | 41°F | 2.6" |
| December | 22°F | 38°F | 30°F | 2.8" |
| Index | Galien | Michigan | National |
| Air quality index | 39 | 69 | 42 |
| Pollution index | 4,961,970 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 260 |
| Days with good air quality | 232 |
| Days with moderate air quality | 26 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.060% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.020% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Grand Beach, MI | 292 | 37 | 26.0% |
| Three Oaks, MI | 1,347 | 37 | 26.0% |
| New Buffalo, MI | 1,613 | 37 | 26.0% |
| La Porte, IN | 21,328 | 37 | 26.0% |
| Rolling Prairie, IN | 408 | 37 | 26.0% |
| Galien, MI | 449 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Seville, CA | 449 | 66 | 32.0% |
| Victor, CO | 449 | 16 | 68.0% |
| Houston, DE | 449 | 42 | 16.0% |
| Humeston, IA | 449 | 39 | 22.0% |
| Waveland, IN | 449 | 45 | 10.0% |
| Galien, MI | 449 | 39 | 22.0% |
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